Test Review Guide

Physical Science Chapter 20-21 Review Guide What is electricity? What are the two types of electricity and describe each. Static charge can be transferred in three ways. Name each and give an example. Positive and negative charges have extra or fewer electrons respectively. What are the two types of electrical current? How is each different? How are conductors and resistors different? What three factors affect electrical resistance in a wire? Name, draw and describe the two types of circuits. Which is found in most businesses, including this school? What are the three safety devices talked about in class. Describe how they work. What is the magnetic force (or magnetism)? How do magnetic poles interact and what happens to magnetic field strength when distance increases? What is the magnetic field around the Earth called and where are the geographical poles located in relation to the magnetic poles. What creates a magnetic field? What is a solenoid? What is an electromagnet? What components make it up? A device that changes mechanical energy into electrical energy is called what? What gives a substance magnetism? How is a magnet different from a non-magnet? Be able to draw a picture to show what you mean. How can you increase the strength of an electromagnet? Draw magnetic field lines from two bar magnets interacting. (Like in the notes; like pole interaction and opposite pole interaction. Be able to explain how lightning occurs (include charge, induction, and friction).